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You are looking at the back of my brain, as seen through the microscope that the surgeon uses throughout the operation. The skull cut has been made, and you can see that the C-1 and C-2 vertebrae have also been cut. The cloudy web-like stuff you see in the center are adhesions, which are about to be removed.
You can also see the cerebellar tonsils are herniated
down to the C-2 vertabra, about 20 mm.
Illustration of the cut from the posterior fossa (skull bone)
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© 1998 Chip Vierow
A special thanks to PressEnter, David Bushard and Steven Reisman for this page space.